<template>
    <div>
        <div class="search">
        <input class="searchInput" type="text" 
            v-model="keyword"
             placeholder="输入城市名或拼音">
        </div>
        <div class="search-content" 
        ref="search"
        v-show="keyword">
            <ul>
                <li 
                class="search-item border-bottom"
                 v-for="item of list" :key="item.id"
                 @click="hanleCityClick(item.name)"
                 >
                 {{item.name}}
                 </li>
                 <li
                 class="search-item border-bottom" v-show='hasNodata'>
                    没有找到匹配数据
                 </li>
            </ul>
        </div>
    </div>
</template>
<script>
import { mapMutations } from 'vuex'
import Bscroll from 'better-scroll'
export default {
    name:'CitySearch',
    props:{
        cities:Object
    },
    data(){
        return {
            keyword:'',
            list:[],
            timer:null
        }
    },
    computed:{
        hasNodata() {
            return !this.list.length;
        }
    },
    watch:{
        keyword(){
            //这里也使用了节流
            if(this.timer){
                clearTimeout(this.timer)
            }
            if(!this.keyword){
                this.list =[];
                return
            }
            this.timer = setTimeout(()=>{
                const result = [];
                for(let i in this.cities){
                    this.cities[i].forEach((value)=>{
                        if(value.spell.indexOf(this.keyword) > -1 || value.name.indexOf(this.keyword) > -1){
                            result.push(value);
                        }
                    })
                }
                this.list = result;
            },100)
        }
    },
    methods:{
         hanleCityClick(city){
            // 改变city的时候 使用dispatch
            // this.$store.commit('changeCity',city);  与下一句等价
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },mounted(){
        this.scroll = new Bscroll(this.$refs.search)
    }
}
</script>
<style lang="stylus" scoped>
    @import "~styles/varibales.styl"; 
    .search
        height :.72rem
        padding :0 .1rem
        background :$bgColor
        .searchInput
            box-sizing :border-box
            width:100% 
            height :.62rem
            padding :0 .1rem
            line-height :.62rem
            text-align :center
            border-radius :.06rem
            color : #666
    .search-content
        z-index:1
        overflow:hidden
        position:absolute
        top:1.58rem
        left:0
        right:0
        bottom:0
        background:#eee
        .search-item
            line-height :.62rem
            padding-left :.2rem
            background :#fff
            color :#666



</style>